(19)
(11) EP 1 601 153 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
04.01.2006 Bulletin 2006/01

(43) Date of publication A2:
30.11.2005 Bulletin 2005/48

(21) Application number: 04026073.9

(22) Date of filing: 03.11.2004
(51) International Patent Classification (IPC): 
H04L 29/06(2006.01)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LU MC NL PL PT RO SE SI SK TR
Designated Extension States:
AL HR LT LV MK YU

(30) Priority: 28.05.2004 EP 04291338

(71) Applicant: SAP AG
69190 Walldorf (DE)

(72) Inventors:
  • Kilian-Kehr, Roger
    64291 Darmstadt (DE)
  • Gomez, Laurent
    06110 Le Cannet (FR)
  • Haller Jochen
    76131 Karlsruhe (DE)
  • Hebert, Cedric
    06370 Mouans Sartoux (FR)

(74) Representative: Müller-Boré & Partner Patentanwälte 
Grafinger Strasse 2
81671 München
81671 München (DE)

   


(54) Client authentication using a challenge provider


(57) A system for providing secured access to an application service includes a challenge provider that uses a first cryptographic technique to provide a challenge to a client seeking access to an application service. The client uses a second cryptographic technique to generate a response, and provides the response to an authentication service. The authentication service grants the client access to the application service only if the challenge and response are authenticated using a first authentication technique complementary to the first cryptographic technique and a second authentication technique complementary to the second cryptographic technique, respectively.







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